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WorksheetsRedox Reactions and Electrochemical Cells
Total questions: 20
Worksheet time: 11mins
Which is false about redox reactions?
involve a transfer of electrons
losing electrons is oxidation
the oxidizing agent increases its oxidation state
include single replacement reactions
Which is true about voltaic cells?
convert electrical energy into chemical energy
the anode is positive
reduction is at the cathode
the reactions are nonspontaneous
In a voltaic cell, where do the electrons flow?
from the anode to the cathode
from the cathode to the anode
from the salt bridge towards the anode
from the salt bridge towards the cathode
In which species does chlorine have an oxidation state of +1?
Cl₂
HCl
ClO⁻
KClO₂
Which of the following is not a redox reaction?
HCl + NaOH → H₂O + NaCl
2Mg + O₂ → 2MgO
Zn + 2HCl → ZnCl₂ + H₂
CH₄ + 2O₂ → CO₂ + 2H₂O
Which is true of the activity series of metals?
less reactive metal replaces the more reactive metal
more reactive metal will be reduced
more reactive metal is a better reducing agent
the less reactive metal will be at the anode
Which of the following is a condition for a standard cell?
0.1 M concentration for solutions
100 kPa pressure for a gas
273 K temperature
measured against zinc
Which is a difference between electrolytic and voltaic cells?
electrolysis reactions are spontaneous
the cathode is negative in electrolysis
reduction occurs at the anode in electrolysis
oxidation occurs at the negative electrode in electrolysis
What are the products of electrolysis of concentrated aqueous sodium chloride?
Na and Cl₂
H₂ and O₂
Na and O₂
H₂ and Cl₂
Which of the following would not increase the amount of a metal being electroplated?
increasing the current
increasing the time of electrolysis
increasing the charge of the ion
increasing the solution concentration
Which is true of the colorful electrolysis of water demo?
hydrogen gas was produced at the anode
the pH was high where hydrogen gas was produced
oxygen gas was produced twice as fast
it turned purple at the cathode
Secondary Cells contain...
Constant supply of fuel
A reversible reaction when charge is applied
Consumable chemicals
Electrolysis of water
A fuel cell ...
does not form any products
has a negative cell potential
uses a spontaneous reaction to generate electricity
produces its own fuel
For lithium-ion batteries...
lithium is the anode
electrons flow from lithium to graphite
electrons flow from graphite to lithium
graphite is the cathode
Which statement best describes the difference between a fuel cell and a secondary cell?
A fuel cell relies on a reversible reaction, while a secondary cell uses a spontaneous reaction.
A fuel cell produces its own fuel, while a secondary cell requires a constant supply of fuel.
A fuel cell uses a spontaneous reaction to generate electricity, while a secondary cell relies on a reversible reaction when charge is applied.
A fuel cell has a negative cell potential, while a secondary cell has a positive cell potential.
Which of the following is not a step for balancing redox reactions in acidic solutions?
Balance elements other than H and O
Balance hydrogen with H+
Balance charge with electrons
Balance oxygen with O2-
Which occurs in any voltaic cell (assuming metals involved in the reaction)?
the cathode gets smaller
electrode sizes don't change
the anode gets smaller
both electrodes get bigger
Which of the following statements applies to the change in mass of the electrodes involved in this electrochemical cell?
Electrode A is the anode and it gains mass
since metal ions are being converted to metal
atoms which often adhere to the electrode.
Electrode C is the anode and it gains mass
since metal ions are being converted to metal
atoms which often adhere to the electrode.
Electrode A is the cathode and it gains mass since metal ions are being converted to metal atoms which often adhere to the electrode.
Electrode C is the cathode and it gains mass since metal ions are
being converted to metal atoms which often adhere to the electrode.
Which of the following is not true of the Winkler method?
it measures dissolved oxygen
BOD measures pollution
it uses a titration with potassium permanganate
iodine is oxidized in the process
Which is the correct relationship among free energy, equilibrium, and cell potential?
If Δ G is negative, Ecell is positive, and K > 1
If Δ G is positive, Ecell is positive, and K > 1
If Δ G is negative, Ecell is positive, and K < 1
If Δ G is negative, Ecell is negative, and K > 1
